Hi,

I feel like this is a stupid question, but I can’t work out the answer, so I apologies if this is something obvious.

How do I set a parameter to a negative value when used for moving a Ref Plane?

I am creating a new custom door, and I want to be able to move the frame within the wall from the centre line, I have a parameter from the centre line to the frame.

This works fine if I want to move the door ‘north’ of the wall, I just type the value into the parameter. But I cannot move it ‘south’, I would expect to type in a minus figure, but Revit won’t accept this – “Parameter Door Offset has an invalid value.”

I can drag the Ref Plane manually to set it in the family editor – but if I drag it ‘South’ the figure in the Family Types dialog is always positive.

Am I missing something??

Cheers.